Effective April 7, 1949,  Zurich, Switzerland, dispatched mail directly to Detroit and Chicago via Foreign Air Mail Route 27.  Previous dispatches terminated at New York.

No cachet was provided for the inaugural mail from Zurich.

This cover was carried on the inaugural Foreign Air Mail Route 27 flight from Zurich, Switzerland to Chicago, Illinois (where it was backstamped) and is a variety of F27-74 in the Foreign Air Mail (FAM) Section of The American Air Mail Catalogue.

In January 2001, TWA filed for a third and final bankruptcy and was acquired by American Airlines. American Airlines laid off many former TWA employees in the wake of the September 11, 2001 attacks. TWA continued to exist as an LLC under American Airlines until July 1, 2003. American Airlines closed the St. Louis hub later that year.